1 /*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "Typeface.h"
18
19 #include <fcntl.h> // For tests.
20 #include <pthread.h>
21 #ifndef _WIN32
22 #include <sys/mman.h> // For tests.
23 #endif
24 #include <sys/stat.h> // For tests.
25
26 #include "MinikinSkia.h"
27 #include "SkPaint.h"
28 #include "SkStream.h" // For tests.
29 #include "SkTypeface.h"
30 #include "utils/TypefaceUtils.h"
31
32 #include <minikin/FontCollection.h>
33 #include <minikin/FontFamily.h>
34 #include <minikin/Layout.h>
35 #include <utils/Log.h>
36 #include <utils/MathUtils.h>
37
38 namespace android {
39
computeAPIStyle(int weight,bool italic)40 static Typeface::Style computeAPIStyle(int weight, bool italic) {
41 // This bold detection comes from SkTypeface.h
42 if (weight >= SkFontStyle::kSemiBold_Weight) {
43 return italic ? Typeface::kBoldItalic : Typeface::kBold;
44 } else {
45 return italic ? Typeface::kItalic : Typeface::kNormal;
46 }
47 }
48
computeMinikinStyle(int weight,bool italic)49 static minikin::FontStyle computeMinikinStyle(int weight, bool italic) {
50 return minikin::FontStyle(uirenderer::MathUtils::clamp(weight, 1, 1000),
51 static_cast<minikin::FontStyle::Slant>(italic));
52 }
53
54 // Resolve the relative weight from the baseWeight and target style.
computeRelativeStyle(int baseWeight,Typeface::Style relativeStyle)55 static minikin::FontStyle computeRelativeStyle(int baseWeight, Typeface::Style relativeStyle) {
56 int weight = baseWeight;
57 if ((relativeStyle & Typeface::kBold) != 0) {
58 weight += 300;
59 }
60 bool italic = (relativeStyle & Typeface::kItalic) != 0;
61 return computeMinikinStyle(weight, italic);
62 }
63
64 const Typeface* gDefaultTypeface = NULL;
65
resolveDefault(const Typeface * src)66 const Typeface* Typeface::resolveDefault(const Typeface* src) {
67 LOG_ALWAYS_FATAL_IF(src == nullptr && gDefaultTypeface == nullptr);
68 return src == nullptr ? gDefaultTypeface : src;
69 }
70
createRelative(Typeface * src,Typeface::Style style)71 Typeface* Typeface::createRelative(Typeface* src, Typeface::Style style) {
72 const Typeface* resolvedFace = Typeface::resolveDefault(src);
73 Typeface* result = new Typeface;
74 if (result != nullptr) {
75 result->fFontCollection = resolvedFace->fFontCollection;
76 result->fBaseWeight = resolvedFace->fBaseWeight;
77 result->fAPIStyle = style;
78 result->fStyle = computeRelativeStyle(result->fBaseWeight, style);
79 result->fIsVariationInstance = resolvedFace->fIsVariationInstance;
80 }
81 return result;
82 }
83
createAbsolute(Typeface * base,int weight,bool italic)84 Typeface* Typeface::createAbsolute(Typeface* base, int weight, bool italic) {
85 const Typeface* resolvedFace = Typeface::resolveDefault(base);
86 Typeface* result = new Typeface();
87 if (result != nullptr) {
88 result->fFontCollection = resolvedFace->fFontCollection;
89 result->fBaseWeight = resolvedFace->fBaseWeight;
90 result->fAPIStyle = computeAPIStyle(weight, italic);
91 result->fStyle = computeMinikinStyle(weight, italic);
92 result->fIsVariationInstance = resolvedFace->fIsVariationInstance;
93 }
94 return result;
95 }
96
createFromTypefaceWithVariation(Typeface * src,const minikin::VariationSettings & variations)97 Typeface* Typeface::createFromTypefaceWithVariation(Typeface* src,
98 const minikin::VariationSettings& variations) {
99 const Typeface* resolvedFace = Typeface::resolveDefault(src);
100 Typeface* result = new Typeface();
101 if (result != nullptr) {
102 result->fFontCollection =
103 resolvedFace->fFontCollection->createCollectionWithVariation(variations);
104 if (result->fFontCollection == nullptr) {
105 // None of passed axes are supported by this collection.
106 // So we will reuse the same collection with incrementing reference count.
107 result->fFontCollection = resolvedFace->fFontCollection;
108 }
109 // Do not update styles.
110 // TODO: We may want to update base weight if the 'wght' is specified.
111 result->fBaseWeight = resolvedFace->fBaseWeight;
112 result->fAPIStyle = resolvedFace->fAPIStyle;
113 result->fStyle = resolvedFace->fStyle;
114 result->fIsVariationInstance = true;
115 }
116 return result;
117 }
118
createWithDifferentBaseWeight(Typeface * src,int weight)119 Typeface* Typeface::createWithDifferentBaseWeight(Typeface* src, int weight) {
120 const Typeface* resolvedFace = Typeface::resolveDefault(src);
121 Typeface* result = new Typeface;
122 if (result != nullptr) {
123 result->fFontCollection = resolvedFace->fFontCollection;
124 result->fBaseWeight = weight;
125 result->fAPIStyle = resolvedFace->fAPIStyle;
126 result->fStyle = computeRelativeStyle(weight, result->fAPIStyle);
127 result->fIsVariationInstance = resolvedFace->fIsVariationInstance;
128 }
129 return result;
130 }
131
createFromFamilies(std::vector<std::shared_ptr<minikin::FontFamily>> && families,int weight,int italic,const Typeface * fallback)132 Typeface* Typeface::createFromFamilies(std::vector<std::shared_ptr<minikin::FontFamily>>&& families,
133 int weight, int italic, const Typeface* fallback) {
134 Typeface* result = new Typeface;
135 if (fallback == nullptr) {
136 result->fFontCollection = minikin::FontCollection::create(std::move(families));
137 } else {
138 result->fFontCollection =
139 fallback->fFontCollection->createCollectionWithFamilies(std::move(families));
140 }
141
142 if (weight == RESOLVE_BY_FONT_TABLE || italic == RESOLVE_BY_FONT_TABLE) {
143 int weightFromFont;
144 bool italicFromFont;
145
146 const minikin::FontStyle defaultStyle;
147 const minikin::MinikinFont* mf =
148 families.empty() ? nullptr
149 : families[0]->getClosestMatch(defaultStyle).typeface().get();
150 if (mf != nullptr) {
151 SkTypeface* skTypeface = reinterpret_cast<const MinikinFontSkia*>(mf)->GetSkTypeface();
152 const SkFontStyle& style = skTypeface->fontStyle();
153 weightFromFont = style.weight();
154 italicFromFont = style.slant() != SkFontStyle::kUpright_Slant;
155 } else {
156 // We can't obtain any information from fonts. Just use default values.
157 weightFromFont = SkFontStyle::kNormal_Weight;
158 italicFromFont = false;
159 }
160
161 if (weight == RESOLVE_BY_FONT_TABLE) {
162 weight = weightFromFont;
163 }
164 if (italic == RESOLVE_BY_FONT_TABLE) {
165 italic = italicFromFont ? 1 : 0;
166 }
167 }
168
169 // Sanitize the invalid value passed from public API.
170 if (weight < 0) {
171 weight = SkFontStyle::kNormal_Weight;
172 }
173
174 result->fBaseWeight = weight;
175 result->fAPIStyle = computeAPIStyle(weight, italic);
176 result->fStyle = computeMinikinStyle(weight, italic);
177 result->fIsVariationInstance = false;
178 return result;
179 }
180
setDefault(const Typeface * face)181 void Typeface::setDefault(const Typeface* face) {
182 gDefaultTypeface = face;
183 }
184
setRobotoTypefaceForTest()185 void Typeface::setRobotoTypefaceForTest() {
186 #ifndef _WIN32
187 const char* kRobotoFont = "/system/fonts/Roboto-Regular.ttf";
188
189 int fd = open(kRobotoFont, O_RDONLY);
190 LOG_ALWAYS_FATAL_IF(fd == -1, "Failed to open file %s", kRobotoFont);
191 struct stat st = {};
192 LOG_ALWAYS_FATAL_IF(fstat(fd, &st) == -1, "Failed to stat file %s", kRobotoFont);
193 void* data = mmap(nullptr, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
194 std::unique_ptr<SkStreamAsset> fontData(new SkMemoryStream(data, st.st_size));
195 sk_sp<SkFontMgr> fm = android::FreeTypeFontMgr();
196 LOG_ALWAYS_FATAL_IF(fm == nullptr, "Could not load FreeType SkFontMgr");
197 sk_sp<SkTypeface> typeface = fm->makeFromStream(std::move(fontData));
198 LOG_ALWAYS_FATAL_IF(typeface == nullptr, "Failed to make typeface from %s", kRobotoFont);
199
200 std::shared_ptr<minikin::MinikinFont> font = std::make_shared<MinikinFontSkia>(
201 std::move(typeface), 0, data, st.st_size, kRobotoFont, 0, minikin::VariationSettings());
202 std::vector<std::shared_ptr<minikin::Font>> fonts;
203 fonts.push_back(minikin::Font::Builder(font).build());
204
205 std::shared_ptr<minikin::FontCollection> collection =
206 minikin::FontCollection::create(minikin::FontFamily::create(std::move(fonts)));
207
208 Typeface* hwTypeface = new Typeface();
209 hwTypeface->fFontCollection = collection;
210 hwTypeface->fAPIStyle = Typeface::kNormal;
211 hwTypeface->fBaseWeight = SkFontStyle::kNormal_Weight;
212 hwTypeface->fStyle = minikin::FontStyle();
213
214 Typeface::setDefault(hwTypeface);
215 #endif
216 }
217 } // namespace android
218